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As I recall, they're colored by a program, not an artist, but it's true that you could produce similar color spectra from a picture of your house. Hm...come to think of it, anyone got any wideband digital spectrographic data of a naked chick? Anyway, in NASA's defense, they've got this digital data, and they need to render it somehow or other, and while they could have chosen uglier colors, they had to be something, and I think they chose well. Fake rays eminating from stars are also arbitrary, but help provide the viewer with a sense of the magnitude of the star. And what the heck, NASA needs money, and prettier pics help them with that. Who among us hasn't touched up a model's breast on a key tour? :-)
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